This work examined the potential of electrochemical disinfection to treat simulated ballast water... more This work examined the potential of electrochemical disinfection to treat simulated ballast water with Artemia salina (A. salina) as an indicator organism. The effect of contact time (residence time in the electrolytic cell) and current density were investigated. Furthermore, the formation of disinfection byproducts (trihalomethanes) was also examined. Under conditions of single pass through the electrolytic cell, a current density of 135 mA/cm 2 and a residence time of around 1 min were required for 100% mortality of A. salina. Dissolved organic carbon due to cell lysis increased by 1-2 mg/L, while the formation of chlorination by-products, expressed as trihalomethanes was very small (less than 10 g/L at 135 mA/cm 2).
Journal of Chemical Technology & Biotechnology, 2010
Invasive aquatic species discharged through ballast water is one of the most serious problems pos... more Invasive aquatic species discharged through ballast water is one of the most serious problems posed nowadays in the marine environment. This review paper summarizes the available technologies applied for ballast water treatment. These technologies can be either port-based or ship-based, with the latter being easier to implement. Special emphasis was given to onboard treatment methods, which can be categorized as physical separation, mechanical or chemical methods. The efficiency of the methods, as well as the capacity of application and the target microorganisms were compiled and are presented in this review.
The present work dealt with the characterization and treatment of liquid wastes produced during t... more The present work dealt with the characterization and treatment of liquid wastes produced during the hydrometallurgical recovery of germanium (Ge) from fly ash. The main metals causing reasons for environmental concern were arsenic (As), nickel (Ni) and antimony (Sb). Precipitation using calcium hydroxide (hydrated lime) was the most efficient method for treating wastewaters with high levels of As, Sb and Ni (up to 99.9% removal). However, relatively large quantities of sludge were produced due to the large doses employed. Reverse osmosis (RO) also proved to be an efficient method achieving heavy metal removals of over 90%. Large quantities of concentrate were produced which required subsequent treatment by lime precipitation. A combined treatment of RO and lime precipitation of the resultant concentrate stream yielded a 97.5% removal of metals. At the same time, a stream with a concentrated level of catechol was obtained that could be reused in the extraction of Ge.
h i g h l i g h t s Ballast water treatment deals with invasive species elimination. Electrochemi... more h i g h l i g h t s Ballast water treatment deals with invasive species elimination. Electrochemical disinfection is an easy to apply process on-board. Modeling of chlorine generation during electrochemical disinfection was performed. Both bacteria (E. coli) and higher organisms (A. salina) were tested as model microorganisms.
This work examined the potential of electrochemical disinfection to treat simulated ballast water... more This work examined the potential of electrochemical disinfection to treat simulated ballast water with Artemia salina (A. salina) as an indicator organism. The effect of contact time (residence time in the electrolytic cell) and current density were investigated. Furthermore, the formation of disinfection byproducts (trihalomethanes) was also examined. Under conditions of single pass through the electrolytic cell, a current density of 135 mA/cm 2 and a residence time of around 1 min were required for 100% mortality of A. salina. Dissolved organic carbon due to cell lysis increased by 1-2 mg/L, while the formation of chlorination by-products, expressed as trihalomethanes was very small (less than 10 g/L at 135 mA/cm 2).
Journal of Chemical Technology & Biotechnology, 2010
Invasive aquatic species discharged through ballast water is one of the most serious problems pos... more Invasive aquatic species discharged through ballast water is one of the most serious problems posed nowadays in the marine environment. This review paper summarizes the available technologies applied for ballast water treatment. These technologies can be either port-based or ship-based, with the latter being easier to implement. Special emphasis was given to onboard treatment methods, which can be categorized as physical separation, mechanical or chemical methods. The efficiency of the methods, as well as the capacity of application and the target microorganisms were compiled and are presented in this review.
The present work dealt with the characterization and treatment of liquid wastes produced during t... more The present work dealt with the characterization and treatment of liquid wastes produced during the hydrometallurgical recovery of germanium (Ge) from fly ash. The main metals causing reasons for environmental concern were arsenic (As), nickel (Ni) and antimony (Sb). Precipitation using calcium hydroxide (hydrated lime) was the most efficient method for treating wastewaters with high levels of As, Sb and Ni (up to 99.9% removal). However, relatively large quantities of sludge were produced due to the large doses employed. Reverse osmosis (RO) also proved to be an efficient method achieving heavy metal removals of over 90%. Large quantities of concentrate were produced which required subsequent treatment by lime precipitation. A combined treatment of RO and lime precipitation of the resultant concentrate stream yielded a 97.5% removal of metals. At the same time, a stream with a concentrated level of catechol was obtained that could be reused in the extraction of Ge.
h i g h l i g h t s Ballast water treatment deals with invasive species elimination. Electrochemi... more h i g h l i g h t s Ballast water treatment deals with invasive species elimination. Electrochemical disinfection is an easy to apply process on-board. Modeling of chlorine generation during electrochemical disinfection was performed. Both bacteria (E. coli) and higher organisms (A. salina) were tested as model microorganisms.
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Papers by Efi Tsolaki